---
title: "QxxR Motif in Me31B Is Required for Drosophila Female Fertility and Germline Development"
id: "biorxiv-27-the-qxxr-motif-of-rna-helicase-me31b-is-essential-for-drosophila-female"
canonical_url: "https://medichelpline.com/clinical-feed/biorxiv-27-the-qxxr-motif-of-rna-helicase-me31b-is-essential-for-drosophila-female"
content_type: "clinical_feed_article"
specialty: "General"
source_name: "bioRxiv (Biomedical Preprints)"
source_url: "https://www.biorxiv.org/content/10.64898/2026.08.27.747641v1?rss=1"
published_at: "2026-08-29T12:00:00.000Z"
evidence_level: "Verified Feed"
license: "CC-BY-NC-4.0 / Informational Use"
---
# QxxR Motif in Me31B Is Required for Drosophila Female Fertility and Germline Development
## Provenance & Clinical Metadata
- **Canonical URL:** https://medichelpline.com/clinical-feed/biorxiv-27-the-qxxr-motif-of-rna-helicase-me31b-is-essential-for-drosophila-female
- **Specialty:** [General](https://medichelpline.com/clinical-feed/general.md)
- **Primary Source:** bioRxiv (Biomedical Preprints)
- **Source URL:** [Original Journal Publication](https://www.biorxiv.org/content/10.64898/2026.08.27.747641v1?rss=1)
- **Published At:** 2026-08-29T12:00:00.000Z
- **Evidence Rating:** Verified Feed
## Executive GIST (TL;DR)
- The QxxR motif is evolutionarily conserved in DEAD-box RNA helicases, including Drosophila **Me31B** and human **DDX6**. - A pathogenic H372R substitution in human DDX6 alters the QxxR motif; the developmental role of this motif was previously unclear. - The authors generated a Drosophila Me31B H333R missense mutant to model the corresponding human substitution in vivo. - The **me31B H333R** allele reduced female fertility in a gene dose–dependent manner; homozygous mutant females were sterile. - Embryos from mutant females showed defects in primordial germ cells, indicating compromised germline development. - Me31B protein abundance, global ovarian transcriptome, and proteome profiles were not significantly changed by the H333R mutation according to the reported analyses. - Representative germ plasm mRNA and protein localization were also reported as not significantly altered in the mutant background. - Bait-normalized immunoprecipitation–mass spectrometry (IP-MS) revealed altered enrichment of specific Me31B-associated proteins, notably increased association with known interactors Trailer hitch (Tral) and Ypsilon Schachtel (Yps). - The findings suggest that the QxxR motif disruption impairs development not by broad changes in gene expression, but likely via altered composition or regulation of **Me31B-containing ribonucleoprotein complexes**. - The Me31B H333R Drosophila model is proposed as an in vivo system to investigate the conserved QxxR motif across DDX6-family proteins.
## Clinical Analysis & Structured Key Points
The QxxR Motif of RNA Helicase Me31B Is Essential for Drosophila Female Fertility and Germline Development | bioRxiv Skip to main content New Results The QxxR Motif of RNA Helicase Me31B Is Essential for Drosophila Female Fertility and Germline Development Raheem Mansoor , Anum S Minhas , Abby Thomas , Ammara A Mansoor , Aidan H McCambridge , Carol Dilts , John Eshak , Deep Govani , Brynn Nylin , Jonathan C Trinidad , Ayah Y Kanaan , Evan Kara , Abraham Fielder , Isaac Fielder , Adriana Iglendza , Yousif Mukatash , Brooke Pumnea , Melissa M Menzel , Ahad L Shabazz-Henry , Matthew G Niepielko , View ORCID Profile Ming Gao doi: https://doi.org/10.64898/2026.08.27.747641 Raheem Mansoor 1 Indiana University Northwest; Find this author on Google Scholar Find this author on PubMed Search for this author on this site Anum S Minhas 1 Indiana University Northwest; Find this author on Google Scholar Find this author on PubMed Search for this author on this site Abby Thomas 1 Indiana University Northwest; Find this author on Google Scholar Find this author on PubMed Search for this author on this site Ammara A Mansoor 1 Indiana University Northwest; Find this author on Google Scholar Find this author on PubMed Search for this author on this site Aidan H McCambridge 1 Indiana University Northwest; Find this author on Google Scholar Find this author on PubMed Search for this author on this site Carol Dilts 1 Indiana University Northwest; Find this author on Google Scholar Find this author on PubMed Search for this author on this site John Eshak 1 Indiana University Northwest; Find this author on Google Scholar Find this author on PubMed Search for this author on this site Deep Govani 1 Indiana University Northwest; Find this author on Google Scholar Find this author on PubMed Search for this author on this site Brynn Nylin 1 Indiana University Northwest; Find this author on Google Scholar Find this author on PubMed Search for this author on this site Jonathan C Trinidad 2 Indiana University Bloomington; Find this author on Google Scholar Find this author on PubMed Search for this author on this site Ayah Y Kanaan 1 Indiana University Northwest; Find this author on Google Scholar Find this author on PubMed Search for this author on this site Evan Kara 3 Marian University; Find this author on Google Scholar Find this author on PubMed Search for this author on this site Abraham Fielder 4 Loyola University Chicago; Find this author on Google Scholar Find this author on PubMed Search for this author on this site Isaac Fielder 5 Pepperdine University; Find this author on Google Scholar Find this author on PubMed Search for this author on this site Adriana Iglendza 4 Loyola University Chicago; Find this author on Google Scholar Find this author on PubMed Search for this author on this site Yousif Mukatash 1 Indiana University Northwest; Find this author on Google Scholar Find this author on PubMed Search for this author on this site Brooke Pumnea 1 Indiana University Northwest; Find this author on Google Scholar Find this author on PubMed Search for this author on this site Melissa M Menzel 6 Kean University Find this author on Google Scholar Find this author on PubMed Search for this author on this site Ahad L Shabazz-Henry 6 Kean University Find this author on Google Scholar Find this author on PubMed Search for this author on this site Matthew G Niepielko 6 Kean University Find this author on Google Scholar Find this author on PubMed Search for this author on this site Ming Gao 1 Indiana University Northwest; Find this author on Google Scholar Find this author on PubMed Search for this author on this site ORCID record for Ming Gao For correspondence: minggao{at}iu.edu Abstract Info/History Metrics Preview PDF Abstract The QxxR motif is evolutionarily conserved within DEAD-box RNA helicases, including Drosophila Me31B and human DDX6, which post-transcriptionally regulate gene expression during animal development. A pathogenic H372R substitution (Qx H R to Qx R R) in the QxxR motif of human DDX6 has been associated with various developmental defects, but how this motif contributes to DDX6-family protein function remains unclear. Here, we used Drosophila Me31B as an in vivo model to investigate the QxxR motifs developmental role. We generated a Drosophila strain carrying the corresponding H333R missense mutation in Me31B and characterized its effects on female fertility, embryonic viability, germline development, and Me31B-associated molecular pathways. The me31B H333R mutation reduced female fertility in a gene dose-dependent manner, with homozygous mutant females being sterile. Embryos from the mutant females also exhibited primordial germ cell defects. Despite these developmental phenotypes, the me31B H333R mutation did not significantly alter Me31B protein abundance, global ovarian transcriptome or proteome profiles, or representative germ plasm mRNA and protein localization. In contrast, bait-normalized IP-MS analysis revealed altered enrichment of selected Me31B-associated proteins, including increased association of known Me31B interactors Trailer hitch (Tral) and Ypsilon Schachtel (Yps). These findings establish Me31B H333R as an in vivo model for investigating the conserved QxxR motif and suggest that disruption of this motif compromises development not through broad changes in gene expression, but potentially through altered composition or regulation of Me31B-containing ribonucleoprotein complexes. Copyright The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission. Back to top Previous Next Posted August 29, 2026. Download PDF Email Thank you for your interest in spreading the word about bioRxiv. NOTE: Your email address is requested solely to identify you as the sender of this article. Your Email * Your Name * Send To * Enter multiple addresses on separate lines or separate them with commas. You are going to email the following The QxxR Motif of RNA Helicase Me31B Is Essential for Drosophila Female Fertility and Germline Development Message Subject (Your Name) has forwarded a page to you from bioRxiv Message Body (Your Name) thought you would like to see this page from the bioRxiv website. Your Personal Message CAPTCHA This question is for testing whether or not you are a human visitor and to prevent automated spam submissions. Share The QxxR Motif of RNA Helicase Me31B Is Essential for Drosophila Female Fertility and Germline Development Raheem Mansoor , Anum S Minhas , Abby Thomas , Ammara A Mansoor , Aidan H McCambridge , Carol Dilts , John Eshak , Deep Govani , Brynn Nylin , Jonathan C Trinidad , Ayah Y Kanaan , Evan Kara , Abraham Fielder , Isaac Fielder , Adriana Iglendza , Yousif Mukatash , Brooke Pumnea , Melissa M Menzel , Ahad L Shabazz-Henry , Matthew G Niepielko , Ming Gao bioRxiv 2026.08.27.747641; doi: https://doi.org/10.64898/2026.08.27.747641 Share This Article: Copy Citation Tools The QxxR Motif of RNA Helicase Me31B Is Essential for Drosophila Female Fertility and Germline Development Raheem Mansoor , Anum S Minhas , Abby Thomas , Ammara A Mansoor , Aidan H McCambridge , Carol Dilts , John Eshak , Deep Govani , Brynn Nylin , Jonathan C Trinidad , Ayah Y Kanaan , Evan Kara , Abraham Fielder , Isaac Fielder , Adriana Iglendza , Yousif Mukatash , Brooke Pumnea , Melissa M Menzel , Ahad L Shabazz-Henry , Matthew G Niepielko , Ming Gao bioRxiv 2026.08.27.747641; doi: https://doi.org/10.64898/2026.08.27.747641 Citation Manager Formats BibTeX Bookends EasyBib EndNote (tagged) EndNote 8 (xml) Medlars Mendeley Papers RefWorks Tagged Ref Manager RIS Zotero Tweet Widget Facebook Like Google Plus One Subject Area Genetics Subject Areas All Articles Animal Behavior and Cognition (7945) Biochemistry (18565) Bioengineering (14718) Bioinformatics (43981) Biophysics (22375) Cancer Biology (19499) Cell Biology (26670) Clinical Trials (138) Developmental Biology (13855) Ecology (20805) Epidemiology (2067) Evolutionary Biology (25250) Genetics (16067) Genomics (23351) Immunology (18528) Microbiology (42092) Molecular Biology (17885) Neuroscience (92579) Paleontology (691) Pathology (2958) Pharmacology and Toxicology (5051) Physiology (8029) Plant Biology (15846) Scientific Communication and Education (2090) Synthetic Biology (4523) Systems Biology (10156) Zoology (2368)
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